API for opening (and tracking) writable file descriptors per disk.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=110066
@ -75,14 +75,12 @@ ssize_t
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bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size)
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{
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ssize_t cnt;
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int rofd;
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int rv;
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ERROR(disk, NULL);
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rofd = disk->d_fd;
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disk->d_fd = open(disk->d_name, O_WRONLY);
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if (disk->d_fd < 0) {
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rv = ufs_disk_write(disk);
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if (rv == -1) {
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ERROR(disk, "failed to open disk for writing");
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return -1;
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}
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@ -93,8 +91,5 @@ bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size)
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return -1;
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}
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close(disk->d_fd);
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disk->d_fd = rofd;
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return cnt;
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}
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@ -130,6 +130,7 @@ int ufs_disk_close(struct uufsd *);
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void ufs_disk_dtor(struct uufsd **);
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int ufs_disk_fillout(struct uufsd *, const char *);
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int ufs_disk_fillout_blank(struct uufsd *, const char *);
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int ufs_disk_write(struct uufsd *);
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__END_DECLS
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@ -50,6 +50,8 @@ __FBSDID("$FreeBSD$");
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/* Internally, track the 'name' value, it's ours. */
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#define MINE_NAME 0x01
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/* Track if its fd points to a writable device. */
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#define MINE_WRITE 0x02
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struct uufsd *
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ufs_disk_ctor(const char *name)
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@ -175,3 +177,27 @@ again: if (stat(name, &st) < 0) {
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return 0;
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}
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int
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ufs_disk_write(struct uufsd *disk)
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{
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int rofd;
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ERROR(disk, NULL);
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if (disk->d_mine & MINE_WRITE)
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return 0;
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rofd = disk->d_fd;
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disk->d_fd = open(disk->d_name, O_RDWR);
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if (disk->d_fd < 0) {
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ERROR(disk, "failed to open disk for writing");
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disk->d_fd = rofd;
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return -1;
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}
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disk->d_mine |= MINE_WRITE;
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return 0;
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}
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